Waitlists are a function of funding, not a direct abstract consequence of socialism. Countries with single payer that have adequate funding - with single payments from taxes that are hugely lower per capita than the US system - do not have long wait lists.

As for walking away - it's hard to do that if you're dying or unconscious.

And of course corporate capitalism always collapses to cartels and monopolies.

The idea that a free market optimised for consumer competition is a mythology, not a reality.

Markets compete for shareholder returns, not customer satisfaction. Customers are only ever a convenient source of profit with inconvenient expectations of service quality and cost.